0
They evolved through mutations and natural selection, of course.
First change:
1. The "primordial soup" became less "soupy" and more "watery" as protobionts got better at incorporating the organic materials into their structures.
Later changes:
2. With oxygenic photosynthesis, oxygen combined with dissolved iron in the oceans. The oxidized material (mostly hematite and magnetite) precipitated out and are found as "banded iron formations" today.
3. With oxygenic photosynthesis, eventually enough oxygen gas was released that it significantly changed the overall makeup of the atmosphere. With free oxygen, an "ozone layer" formed, helping to protect the earth's surface from solar ultraviolet.
What else can I help you with?
What gas has made up the largest portion of earths atmosphere for most of earths history?
Nitrogen has made up the largest portion of Earth's atmosphere for most of Earth's history. It currently makes up about 78% of the atmosphere.
What is a measuWhat is a measurement of the Earths history divided into time periodsrement of the Earths history divided into time periods?
The measurement of Earth's history divided into time periods is called the geological time scale. It is divided into eons, eras, periods, epochs, and ages, with each unit representing a significant change in Earth's geological and biological history.
What is the record of earths history called?
The record of Earth's history is called the geological timescale. It is a classification system that organizes Earth's history into different time intervals based on significant geological events and changes in life forms.
What collection of fossils found and studies by scientists in order to gather information about the history of life on earth and past environments?
The collection of fossils studied by scientists to gather information about the history of life on earth and past environments is called the fossil record. This record includes information about the evolution of organisms, past climates, and ancient ecosystems, providing valuable insights into the earth's history and the processes that have shaped life over time.
What is the largest era and what percentage of earths history does it make up?
The largest era in Earth's history is the Precambrian, which spans from the formation of Earth around 4.6 billion years ago to the beginning of the Phanerozoic eon around 541 million years ago. The Precambrian makes up about 88% of Earth's history.
What caused an aerobic atmosphere during the history of the earth?
The origin of photosynthetic prokaryotes caused an aerobic atmosphere during the history of the earth.
What kinds of organisms live in Earth's most extreme environments and may provide scientists with clues about possible life forms on other planets?
organisms in the archaea kingdom Prokaryotes
What gas has made up the largest portion of earths atmosphere for most of earths history?
Nitrogen has made up the largest portion of Earth's atmosphere for most of Earth's history. It currently makes up about 78% of the atmosphere.
Name several traits of the first prokaryotes?
Prokaryotes reproduce using asexual reproduction. All prokaryotes have cytoskeletons but lack a membrane around their nucleus. The 4 most common shapes for a prokaryotes cell is cocci, bacilli, spirochete, and vibrio.
How did Columbus described earth's shape?
A bit of history how did Columbus described earths shape?
Why did prokaryotes evolve before eukaryotes?
Prokaryotes evolved before eukaryotes because they are simpler in structure and function, making them better suited for surviving in early Earth's harsh conditions. Their ability to adapt quickly to changing environments allowed them to thrive and evolve first.
Are prokaryotes older than eukaryotes in terms of evolutionary history?
Yes, prokaryotes are generally considered to be older than eukaryotes in terms of evolutionary history. Prokaryotes are believed to have appeared on Earth around 3.5 billion years ago, while eukaryotes are thought to have evolved from prokaryotic ancestors around 1.5 billion years ago.
What unicellular prokaryotes are adapted to living in a remarkable number of places?
Archaea are unicellular prokaryotes that are adapted to living in a remarkable number of places. They are extremophiles, thriving in extreme environments such as hot springs, deep-sea hydrothermal vents, and even highly acidic or salty environments. Their diversity and adaptability make them one of the most widespread groups of organisms on Earth.
What is a measuWhat is a measurement of the Earths history divided into time periodsrement of the Earths history divided into time periods?
The measurement of Earth's history divided into time periods is called the geological time scale. It is divided into eons, eras, periods, epochs, and ages, with each unit representing a significant change in Earth's geological and biological history.
What are two ways that scientist's can study earths climate history?
by studying the earth gravity by studying eartquakes
What are two ways that scientist can study earths climat history?
by studying the earth gravity by studying eartquakes
What are two ways that scientist can study earths climate history?
by studying the earth gravity by studying eartquakes
